Usage History of 'axion'

The following chart shows how frequently 'axion' appeared in printed materials over time. For example, the word 'axion' occurred 2 times in books in 1682 and 1,449 times in 2008. From 1682 to 2008, the word 'axion' was used a total of 36,306 times in books scanned by Google. See Reference: Google Ngram project.

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